various details fixed in coding (ruff, pep8, links in the doc)

Author: fchapoton

src/sage/coding/abstract_code.py

@@ -512,7 +512,7 @@ def list(self):
             (1, 0, 1, 0, 1, 0, 1)
             True
         """
-        return [x for x in self]
+        return list(self)
 
     def length(self):
         r"""

src/sage/coding/ag_code.py

@@ -332,7 +332,7 @@ def designed_distance(self):
         """
         Return the designed distance of the AG code.
 
-        If the code is of dimension zero, then a ``ValueError`` is raised.
+        If the code is of dimension zero, then a :class:`ValueError` is raised.
 
         EXAMPLES::
 
@@ -576,7 +576,7 @@ def designed_distance(self):
         """
         Return the designed distance of the differential AG code.
 
-        If the code is of dimension zero, then a ``ValueError`` is raised.
+        If the code is of dimension zero, then a :class:`ValueError` is raised.
 
         EXAMPLES::
 

src/sage/coding/code_bounds.py

@@ -192,10 +192,10 @@ def _check_n_q_d(n, q, d, field_based=True):
     Check that the length `n`, alphabet size `q` and minimum distance `d` type
     check and make sense for a code over a field.
 
-    More precisely, checks that the parameters are positive integers, that `q`
-    is a prime power for codes over a field, or, more generally, that
-    `q` is of size at least 2, and that `n >= d`. Raises a ``ValueError``
-    otherwise.
+    More precisely, this checks that the parameters are positive
+    integers, that `q` is a prime power for codes over a field, or,
+    more generally, that `q` is of size at least 2, and that `n >= d`.
+    This raises a :class:`ValueError` otherwise.
 
     TESTS::
 

src/sage/coding/code_constructions.py

@@ -155,8 +155,8 @@ def _is_a_splitting(S1, S2, n, return_automorphism=False):
     This is a special case of Theorem 6.4.3 in [HP2003]_.
     """
     R = IntegerModRing(n)
-    S1 = set(R(x) for x in S1)
-    S2 = set(R(x) for x in S2)
+    S1 = {R(x) for x in S1}
+    S2 = {R(x) for x in S2}
 
     # we first check whether (S1,S2) is a partition of R - {0}
     if (len(S1) + len(S2) != n-1 or len(S1) != len(S2) or

src/sage/coding/databases.py

@@ -174,7 +174,7 @@ def best_linear_code_in_codetables_dot_de(n, k, F, verbose=False):
     i = s.find("<PRE>")
     j = s.find("</PRE>")
     if i == -1 or j == -1:
-        raise IOError("Error parsing data (missing pre tags).")
+        raise OSError("Error parsing data (missing pre tags).")
     return s[i+5:j].strip()